Run leds constantly On and Off

I recently bought a unipi M103, I mounted it on and installed ubuntu. I immediately agreed that the run LEDs continue to turn on and off constantly. I can safely access the unipi via ssh but I do not understand why this behavior. In the documentation I read that for this type of signal is associated with a malfunction of the HW, what should I do in these cases?

@dsurname short blink after 2 secs means, that the main program, that controls the IOs (e.g. evok if installed). If it is on for 2secs and then off for 2secs, it means that the there is no master app trying to communicate with the IOs

Basically using node js and modbus-serial as module i want to read from a thermostat. I plug in the A and B cables and using /dev/ttyAMA0 as port. But seems not to work because i don't receive nothing from the thermostats

@dsurname it's now a bit offtopic from the thread description, so please start a new topic which will better describe your issues. At first, you do not need to worry about the RUN led. If you try to read a DI, the behavior of RUN led will change.

/dev/ttyAMA0 is the UART of RPi, not the RS485 of Neuron. If you want to access the RS485, you need to install UniPi drivers (currently is part of in Evok https://github.com/UniPiTechnology/evok, in future, there will be Debian packages). Once installed, the RS485 ports are will be available for example at /dev/extcomm/0/0